Originally indicated as an alarm alert in a 1990s US publication, this circuit can be used as a shield to control a strobe lamp. The sensor is a optocoupler with LDR.
This simple test circuit was found in the April 1983 issue of Radio Electronics magazine. The...
This circuit for 6 lamps was found in old American documentation. The supply is of high voltage...
This sensitive three-transistor circuit was found in Electronics Now magazine and is...